CODEWITHSUNDEEP
bashverbosity
stav meir
stav meir

Reputation: 403

Check current bash verbosity

I know bash can be set to verbose mode by using set -v, however I want to write a function that doesn't run in verbose mode even if called from a verbosed script.

While I'm aware I could disable verbosity by using set +v at the start of the function and end it with set -v, that would mean my function will set any script that calls it to verbose, even if it wasn't verbose before calling it.

Ideally I'd check the verbosity level at the start of the function, disable verbosity, and revert the verbosity change at the end of the function.

Is there a way to find current verbosity level?

Upvotes: 2

Views: 1090

Answers (4)

Kusalananda
Kusalananda

Reputation: 15613

if test -o verbose; then
   echo 'shell is running in verbose mode'
else
   echo 'shell is not running in verbose mode'
fi

or, equivalently,

if [[ -o verbose ]]; then
   echo 'shell is running in verbose mode'
else
   echo 'shell is not running in verbose mode'
fi

The built-in test utility in bash is able to test whether a shell option is set or not using -o OPTION. See help test in an interactive bash shell, or read about it is the bash manual.

Your function may look like

foo () {
    if [[ -o verbose ]]; then
        set +v
        trap 'set -v' RETURN
    fi

    # do stuff
}

This detects whether -v is active when the function is called. If it is, it is turned off and a RETURN trap is installed that will switch it back on again when the function returns (at the end of the function, or by an explicit return statement).

Upvotes: 1

that other guy
that other guy

Reputation: 123490

Depending on your function and its usage, you could just limit the scope of option changes with a (..) subshell:

foo() (
  set +vx
  echo "not verbose"
)

set -v
foo
echo "still verbose"

Upvotes: 0

Cyrus
Cyrus

Reputation: 88654

if [[ $- =~ v ]]; then 
  echo "verbose enabled"
else
  echo "verbose disabled"
fi

$-: Contains the current set of enabled options. See: help set

Upvotes: 5

KamilCuk
KamilCuk

Reputation: 141155

Checking verbose mode option is the same as checking any other bash option, see In bash, how to get the current status of set -x? .

Try this:

func() {
   local old_verbosity_level=${-//[^v]}
   set +v
   ...
   if [ -n "$old_verbosity_level" ]; then set -v; else set +v; fi
}

or more tricky:

func() {
   local old_verbosity_level=${-//[^v]}
   set +v
   ...
   ${old_verbosity_level:+set -v}
}

Upvotes: 0

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